Multiple promoters and targeted microRNAs direct the expressions of HMGB3 gene transcripts in dairy cattle

文献类型： 外文期刊

第一作者： Li, Liming

作者： Li, Liming;Huang, Jinming;Ju, Zhihua;Li, Qiuling;Wang, Changfa;Qi, Chao;Zhang, Yan;Hou, Qinlei;Zhong, Jifeng;Li, Liming;Hang, Suqin

作者机构：

关键词： dairy cow;functional single nucleotide polymorphisms;mastitis;microRNAs;splice variant

期刊名称：ANIMAL GENETICS （ 影响因子：3.169； 五年影响因子：3.058 ）

ISSN： 0268-9146

年卷期： 2013 年 44 卷 3 期

页码：

收录情况： SCI

摘要： HMGB3 (high-mobility group box 3) is an X-linked member of a family of sequence-independent chromatin-binding proteins and functions as a universal sentinel for nucleic acidmediated innate immune responses. The splice variant expression, promoter characterization and targeted microRNAs of the bovine HMGB3 gene were investigated to explore its expression pattern and possible regulatory mechanism. The results revealed that the expression of HMGB3 transcript variants 1 and 2 (HMGB3-TV1 and HMGB3-TV2) mRNA in the mastitis-infected mammary gland tissues was up-regulated by 8.46- and 5.31-fold respectively compared with that in healthy tissues (P<0.05). HMGB3-TV1 was highly expressed in the mammary gland tissues, whereas HMGB3-TV2 was expressed primarily in liver. Functional analyses indicated that HMGB3 transcription is regulated by three distinct promoters promoters 1, 2 and 3 (P1, P2 and P3) resulting in two alternative transcripts with the same 3-untranslated region. Promoter luciferase activity analysis suggested that the core sequences of P1 and P2 were mapped in the region of g.1535 to similar to g.2076 and g.2074 to similar to g.2491 respectively. The g.5880C>T SNP in P3 affected its base promoter activity, and different genotypes were associated with the bovine somatic count score. The expression of targets bovine miR-17-5p, miR-20b and miR-93 of the HMGB3 gene was down-regulated 1.56-, 1.72- and 2.94-fold respectively in mammary gland tissues as compared with that in healthy tissues (P<0.05). The findings suggest that HMGB3 expression is under complex transcriptional and post-transcriptional control by alternate promoter usage, alternative splicing mechanism and microRNAs in dairy cattle.

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